tools/testing/selftests/kselftest/prefix.pl

Source file repositories/reference/linux-study-clean/tools/testing/selftests/kselftest/prefix.pl

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/kselftest/prefix.pl
Extension
.pl
Size
475 bytes
Lines
25
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
# Prefix all lines with "# ", unbuffered. Command being piped in may need
# to have unbuffering forced with "stdbuf -i0 -o0 -e0 $cmd".
use strict;
use IO::Handle;

binmode STDIN;
binmode STDOUT;

STDOUT->autoflush(1);

my $needed = 1;
while (1) {
	my $char;
	my $bytes = sysread(STDIN, $char, 1);
	exit 0 if ($bytes == 0);
	if ($needed) {
		print "# ";
		$needed = 0;
	}
	print $char;
	$needed = 1 if ($char eq "\n");
}

Annotation

Implementation Notes